Reference evapotranspiration based on FAO-56 Penman-Monteith method

What Reference evapotranspiration based on FAO-56 Penman-Monteith method can do for you

Calculate a daily value of reference evapotranspiration, useful for vegetation (incl. crop) models. The module code is based on FAO-56 Penman-Monteith method. The implementation is based on several sources (see moduleReferences), but particularly useful was the Evapotranspiration R package (Guo et al. 2016, 2022 (v1.16), https://cran.r-project.org/web/packages/Evapotranspiration/index.html). Note: values of C_n and C_d are fixed for using the grass cover reference (900 and 0.34); values for the alfalfa reference are 1600 and 0.38.

Inputs

Name	Type	Description
par_elevation	float	elevation above sea level of the soil where the reference evapotranspiration is to be calculated.
par_temperature_daily_mean	float	Mean daily air temperature above the ground surface where the reference evapotranspiration is to be calculated.
par_temperature_daily_min, par_temperature_daily_max	float	Minimum and maximum daily air temperature above the ground surface where the reference evapotranspiration is to be calculated.
par_netSolarRadiation	float	Solar radiation energy received by the soil surface, discounting loss by albedo reflection.
windSpeed	float	Wind speed at 2m above the soil surface (fixed to 2 as constant in code, as per Allen et al. 1998 recommendation in absence of data).

Outputs

Name	Type	Description
ETr	float	The evapotranspiration in millimeters of water per day assuming a reference surface that is not short of water and covered by a hypothetical grass (or alfalfa) reference crop with specific characteristics. It is referenced in the bibliography also as ETo.

Reference evapotranspiration based on FAO-56 Penman-Monteith method

What Reference evapotranspiration based on FAO-56 Penman-Monteith method can do for you

Inputs

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